Sample Source Code: Salesforce Tutorials by Salesforce Followers

An updated list of over 100 Salesforce tutorials has been released as May 2015. It contains information of Force.com, Data.com, Salesforce1, and Heroku. Most guides contain documentation, the association with a specific service, and identifiable keywords. PDFs available for download. All tutorials in English, but some of them offered in both English and Japanese languages.